PAC RadioPRO4 RP4.2-BM21 Radio Replacement Interface for Select BMW Vehicles

The PAC RadioPRO4 RP4.2-BM21 Radio Replacement Interface for Select BMW Vehicles is a vehicle-specific interface for installing an aftermarket radio while retaining the supported factory features listed by PAC. It combines the required data-bus connections with application-dependent steering-wheel-control, amplifier, chime, camera, accessory-power, and navigation-output functions.

At a Glance

• Vehicle-specific radio-replacement interface for the exact applications listed below
• Connects an aftermarket radio while retaining supported factory convenience and audio features
• Provides application-dependent accessory power and navigation outputs
• Factory features, required accessories, and limitations vary by vehicle and radio configuration
• Retains OEM steering wheel control functions (pre-programmed)
• Data controlled 10 amp accessory output
• Removes SOS error light from cluster after factory radio is removed
• Data controlled outputs for connecting an aftermarket navigation radio
• Single programmable 12V output
• Easily configurable using a PC application
• Highly visible tricolor LEDs to keep the user informed of the module’s status
• Retains factory amplifier (Non-Fiber Optic)
• Retains i-Drive control. Operates some features of the aftermarket radio (tuning, etc.)
• Retains warning chimes (including rear park assist and front collision detection)

Exact Vehicle Compatibility

Find your vehicle below and match the model year, trim, factory radio, amplifier, screen, and equipment details shown in the same row. If your vehicle or factory configuration is not listed, contact MCOR before ordering.

Compatibility & What You Need

• Required interface: PAC RP4.2-BM21. This part number must match the application exactly.
• Aftermarket radio: Sold separately. Confirm that it has the inputs and outputs required for every factory feature you want to retain.
• Application accessories: Camera, USB, satellite-radio, rear-seat-entertainment, antenna, steering-wheel-control, or firmware accessories may be required where stated in the table or current PAC guide.
• Programming: Use the current PAC firmware and follow the current product instructions before final testing.
• Professional installation is strongly recommended for data-bus radio replacement.

Important Application Notes

• Vehicles with the upper CCC/CIC display are not recommended for radio replacement because the display and access to some vehicle settings are lost.
• Fiber-optic factory amplifiers are not retained.
• BMW 1 Series models with navigation and the 2006 BMW 3 Series coupe are not compatible.
• The included constant-power wire must be run to the battery in the trunk.

Technical Specifications

Manufacturer Resources

• Download (780.21k)

What's Included

• One genuine PAC RP4.2-BM21 interface package
• Manufacturer-supplied harnesses, modules, and connection leads shown for this exact part number

Sold separately: aftermarket radio, dash kit, antenna adapter, camera/USB/retention accessories, and installation materials unless expressly shown and identified as included.

Fitment disclaimer: Compatibility is not determined by year and model alone. Verify the exact factory radio, screen, amplifier, audio package, connector, vehicle options, firmware, and every required accessory before ordering. Product photos show the listed PAC package; surrounding installation equipment is not included. Contact MCOR Automotive through the chat button for application help.

Why Buy From MCOR Automotive

• Authorized PAC retailer with manufacturer-backed warranty support
• Vehicle-specific compatibility help before purchase
• Professional car-audio integration and installation support